We published a Working Paper (in German) entitled "Optionen der politischen Regulierung des Personenverkehrs. Ergebnisse einer Simulationsstudie" to be retrieved from http://hdl.handle.net/2003/36806. It entails experiments on political measures to foster sustainable person transport. The introduction of a free of charge public transport system had no impact on sustainability in our experiments, while raising the bicycle's perceived comfort or the car's operational costs showed to be valid ways to achieve a more sustainable transport.